NM360钢SH-CCT曲线测定及组织分析  

Measurement and Microstructure Analysis of SH-CCT Curve of NM360 Steel

作　　者：杜全斌[1,2] 马成勇[2] 张元杰[1,2] 彭云[2] 王华昆[1] 

机构地区：[1]昆明理工大学,云南昆明650093 [2]钢铁研究总院先进钢铁流程及材料国家重点实验室,北京100081

出　　处：《热加工工艺》2013年第17期192-195,共4页Hot Working Technology

摘　　要：针对国内某钢厂最新研制的NM360钢，采用Gleeble．3800热模拟试验机，利用热膨胀法测定了该钢的SH．CCT曲线，并对不同‰条件下粗晶热影响区的组织进行了分析。结果表明，获得完全马氏体的临界冷却速度约为50℃／s，获得完全贝氏体的临界冷却速度为0．5℃／s；随着‰的降低，过热区的光学显微组织由铁素体和贝氏体混合组织向完全贝氏体组织、以及马氏体和贝氏体混合组织转变；ts/s5 在6～15S时，过热区组织为板条马氏体和板条贝氏体混合组织，为该钢焊接热影响区过热区的高强高韧提供了保证。The SH-CCT curves of NM360 steel were measured by thermal expansion in Gleeble-3800 thermo-mechanical simulator, and the microstructure of CGHAZ in different ts/5 was discussed. The results show that the critical cooling rate of getting martensite is completely 50℃/s, and the critical cooling rate of getting bainite completely is 0.5℃/s. The optical microstructure of CGHAZ changes from F＋B into B and B＋M. The microstructure of CGHAZ is dual-phase of lath martensite and lath bainite when ts/5 is 6-15s, and the phase can ensure high strength and high toughness of CGHAZ of the steel.

关 键 词：NM360钢 SH CCT 显微组织 维氏硬度 

分 类 号：TG406[金属学及工艺—焊接] TG47